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NEET UG PHYSICS MCQ: RAY OPTICS
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Medium
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Analyzing
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Assertion: The focal length of lens does not change when red light is replaced by blue light.
Reason: The focal length of lens does not depends upon colour of the light used.
Reason: The focal length of lens does not depends upon colour of the light used.
View answer and explanation
Correct option: D
If both assertion and reason are false.
Option D (If both assertion and reason are false) is correct because the focal length of a lens changes with the color of light due to the refractive index's dependence on wavelength.
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Statement-A: The minimum distance between an object and its real image formed by a convex lens is .
Statement-B: The distance between an object and its real image is minimum when its magnification is -1. Assertion: We cannot produce a real image by plane or convex mirrors under any circumstances.
Reason: The focal length of a convex mirror is always taken negative. If both the object and image are at infinite distance from a refracting telescope its magnifying power will be equal to
Statement-B: The distance between an object and its real image is minimum when its magnification is -1. Assertion: We cannot produce a real image by plane or convex mirrors under any circumstances.
Reason: The focal length of a convex mirror is always taken negative. If both the object and image are at infinite distance from a refracting telescope its magnifying power will be equal to